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Commit af9978ff authored by David Collins's avatar David Collins
Browse files

mfd: qcom-spmi-pmic: add support for slow SPMI busses 



Add device tree support for configuring if mutexes or spinlocks
should be used in the regmap configuration (i.e. the fast_io
element value).  This ensures that qcom-spmi-pmic slave devices
can be used with SPMI busses that must operate in process
context.

Change-Id: I3abdee36935457db497ce6ff2a242755fc3aff90
Signed-off-by: default avatarDavid Collins <collinsd@codeaurora.org>
parent 9a33914e

Documentation/devicetree/bindings/mfd/qcom,spmi-pmic.txt

+2 −0
Original line number Diff line number Diff line
@@ -42,6 +42,8 @@ Optional properties for peripheral child nodes: 
                   see:

                   Documentation/devicetree/bindings/spmi/qcom,spmi-pmic-arb.txt

- interrupt-names: Corresponding interrupt name to the interrupts property

- qcom,can-sleep:  Boolean flag indicating that processes waiting on SPMI

		   transactions may sleep



Each child node of SPMI slave id represents a function of the PMIC. In the

example below the rtc device node represents a peripheral of pm8941

drivers/mfd/qcom-spmi-pmic.c

+13 −2
Original line number Diff line number Diff line 
/*

 * Copyright (c) 2014-2015, The Linux Foundation. All rights reserved.

 * Copyright (c) 2014-2015, 2017, The Linux Foundation. All rights reserved.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 and
@@ -118,11 +118,22 @@ static const struct regmap_config spmi_regmap_config = { 
	.fast_io	= true,

};



static const struct regmap_config spmi_regmap_can_sleep_config = {

	.reg_bits	= 16,

	.val_bits	= 8,

	.max_register	= 0xffff,

	.fast_io	= false,

};



static int pmic_spmi_probe(struct spmi_device *sdev)

{

	struct device_node *root = sdev->dev.of_node;

	struct regmap *regmap;



	if (of_property_read_bool(root, "qcom,can-sleep"))

		regmap = devm_regmap_init_spmi_ext(sdev,

						&spmi_regmap_can_sleep_config);

	else

		regmap = devm_regmap_init_spmi_ext(sdev, &spmi_regmap_config);

	if (IS_ERR(regmap))

		return PTR_ERR(regmap);